Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf6d9fba21abaa8…

MALICIOUS

PDF

85.1 KB Created: 2021-03-24 00:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e1a6487d19929a63f9ff0b743c91a191 SHA-1: 149f2bde5ca7acb2b360eead416184dacc6cd1cb SHA-256: 4cf6d9fba21abaa8537a9859b7495cb99715bfd8560c9bec25ce13dd26fd38b7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'geometric shapes design pdf' and 'wkhtmltopdf', indicating a potential lure to disguise the malicious intent. The presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/award?keyword=geometric+shapes+design+pdf PDF link annotation
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/c20bfc.pdfIn PDF document text
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/c77daa420a.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/engineering_mechanics_dynamics_eighth_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/ZmThf3m/37146417734.pdfIn PDF document text
    • https://xebagamalod.weebly.com/uploads/1/3/1/3/131383607/b3ccaa092149f.pdfIn PDF document text
    • https://cdn.sqhk.co/goloravevi/gfAmihf/formel_amortisationsrechnung_statisch.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/5519971.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/jf6U3ih/61352395060.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/643849d5.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/meade_autostar_suite_for_mac.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/ffccb820209.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/arduino_bluetooth_programming.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/d0Jghn1/28219034253.pdfIn PDF document text
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/wavotosepi-rarabidazuzas-xuragala.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/47150431343.pdfIn PDF document text
    • https://sitizoxibe.weebly.com/uploads/1/3/4/3/134317871/vorowupubatidexujev.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/17047868158.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/8131496.pdfIn PDF document text
    • https://vewirorerisemi.weebly.com/uploads/1/3/4/6/134627211/3077170.pdfIn PDF document text
    • https://vadizomozizi.weebly.com/uploads/1/3/5/4/135400682/4c87d7ea5eea05.pdfIn PDF document text
    • https://dudixojazimonam.weebly.com/uploads/1/3/4/6/134638097/2779005.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/jdjchcg/brick_n_ball_game_for_java_download.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/9770809.pdfIn PDF document text
    • https://wabexerimib.weebly.com/uploads/1/3/0/7/130739061/e78fea7bf86a22.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/wibimajozorun_fasedepuxomino_xuwor_tiwowopef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifotabelimudon.myartsonline.com/68449378760.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 5568 bytes
SHA-256: ecc5acc02f76f95e45364da3d920fdc0906b38848c03628d0ae7c5ce4d2bba09
font_01_sfnt_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 10208 bytes
SHA-256: d180bcbd7f8ee199b7c8e8e9e92eb2c2112c9433d9c69ef67b17a36f2384053b

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